镧负载改性TiO2太阳光催化降解微囊藻毒素的研究  

Solar photocatalytic degradation of microcystin by lanthanum-loaded TiO_2 catalyst

作　　者：陈娟[1] 陈灏[1] 

机构地区：[1]中国科学院生态环境研究中心环境水质学国家重点实验室

出　　处：《环境工程学报》2008年第7期886-890,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金重点基金资助项目(20537020);国家“973”重点基础研究发展规划项目(2002CB412308)

摘　　要：考察了镧负载改性TiO2催化剂在太阳光下降解微囊藻毒素LR(MCLR)的效果及其影响因素。结果表明,镧负载改性的TiO2可显著增加MCLR在TiO2表面的吸附量,同时提高MCLR在太阳光下的降解率。随着镧负载量的增加,太阳光下MCLR降解率可从65%提高到95%,pH降低可促进MCLR的降解。改性TiO2对藻毒素的降解存在最佳投加量,实验结果表明,在pH=6,MCLR初始浓度为2 mg/L,0.001-La-TiO2的最佳投量为0.5 g/L,在3 600μW/cm2太阳光下照射30 min,降解率可达97%。Solar photocatalytic degradation of microcystin-LR （MCLR） and the influencing factors were studied using lanthanum-loaded TiO2. Results showed that the adsorption capacity of MCLR on lanthanum moditided TiO2 was significantly enhanced and MCLR degradation efficiency was increased under solar light irradiation. The increasing loading weight of lanthanum improved the degradation rate of MCLR from 65% to 95% ,and the degradation of MCLR could be enhanced with decreasing pH value. The optimal dosage of 0. 001-La-TiO2 was determined as 0.5 g/L under the conditions of pH = 6, 2 mg/L initial concentration of MCLR, 3 600μW/ cm2 of solar radiation for 30 min, when the degradation of MCLR reached 97%.

关 键 词：太阳光催化 降解 镧负载TiO2 MCLR 

分 类 号：X703.1[环境科学与工程—环境工程]